Automatic stop for hoists.



PATENTED JUNE 26, 1906.

F. H. KOHLBRAKER. AUTOMATIC STOP FOR HQISTS.

APPLIOATION FILED snr'r e 1905 2 SHEETS-:SHEET 1.

PATENTED JUNE 26, 1906.

P. H. KOHLBRAKER. AUTOMATIC STOP FOR HOISTS.

APPLICATION FILED SEPT. 6, 1905.

2 SHEETS-SHEET 2.

WITNESSES:

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IINITED STATES PATENT OFFICE.

FRANCIS H. KOHLBRAKER, OF NANTIOOKE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO MORRIS WILLIAMS, OF PHILADELPHIA, PENNSYL- VANIA.

Specification of Letters Patent.

iatented June 26, 1906.

Application filed September 6, 1905. Serial No. 277.173.

To all whom it may concern:

Be it known that I, FRANCIS H. KoHL- BRAKER, a citizen of the United States, and a resident of Nanticoke, in the county of Luzerne and State of Pennsylvania, have invented a new and Improved Automatic Stop for Hoists, of which the following is a full, clear, and exact description.

This invention relates to improvements in safety devices or stops for hoists or elevators employed particularly at mines, the object being not only to provide a throttle-valve cut-off mechanism that may be operated by the cage should it rise too high in its shaft by overwinding of the hoisting-engine drum, but to provide means directly under the control of the engineer whereby the valve or valves may be closed and the brake set to instantly stop the engine should any of the parts of the engine become disarranged, such manual operation taking place without disturbing the automatic device, thus saving time and trouble of resetting said device, as is necessary with the construction shown in the patent granted to me March 29, 1898, Serial No. 601,515.

I will describe an automatic stop for hoists embodyin my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the fig ures.

Figure 1 is an elevation of a hoisting apparatus with a stop mechanism embodying my invention thereon. Fig. 2 is a section on the line a: at of Fig. 1. Fig. 3 shows in perspective a trip-lever employed. Fig. 4 is a plan of the valve-actuating mechanism. Fig. 5 is a section on the line y y of Fig. 4, and Fig. 6 is a section on the line 2 z of Fig. 4.

Referring to the drawings, 1 designates the usual cage or elevator operating in the shaftframe 2, and from the cage a hoisting-cable 3 passes over the sheave 4 to a winding-drum 5, which is operated through a crank-rod connection 6 with the rod of a piston operating in the steam-cylinder 7, on which is the usual throttle valve or valves 8. Mounted to swing on a cross-bar 9 of the shaft-frame is a triplever 10, which has one end turned inward at rlght angles and provided with an extension '11, designed to be engaged by a cross-bar 12 on the cage should said cage rise too high, as

will be hereinafter described. The trip-lever has a link connection 13 with a lever 14, pivoted to a hanger 15, and on the inner or free end of the lever 14 is a roller 16, which normally engages with a trigger 17, mounted to swing on the shaft-frame. From this trigger 17 a small wire cable 18 extends to a connection with the upper end of a-swinging upright 19, extended outward from which is a weighted arm 20. This swinging upright 19 is arranged near the engine, as are the other parts now to be described.

Supported in pillow-blocks 21 is a shaft 22, having near its ends outwardly-extended weighted arms 23, and also near its ends it has outwardly-extended arms 24, which have link connections 25 with cranks 26, attached to the stems of the throttle-valves. Mounted on the shaft 22, and in which said shaft mayrotate, is a sleeve 27, at one end of which is an outwardly-extended weighted arm 28, the end of said arm normally resting on a roller 29 on the swinging upright 19. At the opposite end of the sleeve 27 an actuatinglever 30 is rigidly attached to the shaft 22, and it is designed that at certain times, or when the parts are in normal position, the shaft 22 will have locking engagement with the sleeve. For this purpose a rod 31 is carried by the lever 30 and has a dog 32 at its lower end for engaging in a notch in the end of the sleeve 27 and also in a notch formed in the hub 33 of the lever 30. The rod is drawn upward to release the dog from the sleeve by means of the usual hand-piece 34. A band friction-brake 35 for the drum 5 has its ends attached to the cross-head of a lever 36, from the lower end of which a rod 37 extends to pivotal connection with the hub of the lever 30.

In the operation when the parts are in the osition indicated in Fig. 1 and the sleeve ocked to the shaft 22 should there be an overwinding or the cage moved too high its crossbar will en age the trip-lever, forcing it upward, and this upright movement of the triplever will move the lever 14 above the lever 16, thus permitting said lever 16 to swing and slacken the cable 18. As the cable slackens the weighted arm 20 will cause the swinging u right 19to swing out of enga ement with t e end of the arm 28. Then t e weighted arms extended from the shaft will cause a rotary movement thereof, immediately closing the valve or valves and also tightening the brake. As before stated, it may be nec essary at times to close the valves and set the brake when the cage is in any other position than at the top. Therefore in such emergency the engineer grasps the lever 30, drawing the dog 32 out of its engagement with the sleeve 27, and then, as the lever is keyed to the shaft, the lever may be rotated to close the valves and operate the brake.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a stop mechanism for a hoisting device, a trip-lever adapted to be engaged by the hoisting-cage, a lever having link connection with the trip-lever, a trigger having de tachable connection with said last-named lever, and a flexible connection between said trigger and the valve-controlling mechanism.

2. In a hoisting apparatus, a cage and a motor therefor, means controlled by the cage for causing a closing of the motor-valve, and manually-operated means for closing said valve without disturbing the elements controlled by the cage.

3. In a hoisting apparatus comprising a cage, a motor therefor, an inlet-controlling valve for the motor, a shaft having connection with said valve, means for holding said shaft in normal. position, devices adapted to be actuated by the cage for releasing said holding devices, a sleeve on said shaft and in. which the shaft may turn, a lever secured to the shaft, and means for placing the shaft and sleeve in locked position.

4. A hoisting apparatus comprising a cage, a motor therefor, a valve for controlling the inlet of motive agent to the motor, a shaft, a connection between said shaft and said valve, a device for holding the shaft in normal position, means actuated by the cage for releasing the said holding device, a sleeve through which the sleeve loosely passes, a lever extended rigidly from the shaft, a locking device carried by the lever for engaging with said sleeve, and a drum-brake operated by a movement of the shaft.

5. A hoisting apparatus comprising a cage, a motor, an inlet-controlling valve for the motor, a shaft, weighted arms extended outward from said shaft, a connection between the shaft and the valve, a sleeve through which the sleeve loosely passes, a lever secured to said shaft, means carried by the lever for interlocking with the sleeve, an arm extended from the sleeve, a vertically-swinging support with which said last-named arm is designed to engage, a weight for moving said support in one direction, devices adapted to be actuated by the cage, and a cable connection between said devices and said support.

6. In a hoisting apparatus, a cage, a motor therefor, a valve for controlling the inlet to the motor, a shaft arranged adjacent to the motor, a connection between said shaft and valve, weighted arms extended outward from the shaft, a sleeve through which the sleeve loosely passes, means for interlocking the sleeve and shaft, a lever extended from the shaft and rigidly connected thereto, a weighted arm extended outward from the sleeve, a vertic ally-extended swinging supporting-b ar, a roller on said bar with which the last-named arm is designed to engage, a weight for moving the said supporting-bar in one direction, a trip-lever adapted to be engaged by the hoistcage, a trigger adapted to be released by a movement of said trip-lever, and a cable connection between said trigger and said swineing support.

In testimony whereof I have signed my name to this specification in the presence-of two subscribing witnesses.

FRANCIS Hj KOHLBRAKER.

\Vitnesses:

Roar. B. Jon, Joe. S. FALCON. 

